The line closed the 'knowing is half the battle' public service announcements attached to G.I. Joe: A Real American Hero, the Sunbow/Marvel animated series that aired from 1983 to 1986. Each PSA showed kids in a risky situation, a Joe character stepping in with advice, and the narrator's sign-off. Clips of the endings circulated for years as nostalgia before becoming a reaction meme, quoted whenever someone learns something the easy or the hard way, and the phrasing is now shorthand for a lesson finally sinking in.